//
//  MainTabbar.swift
//  weibo项目
//
//  Created by mac on 16/1/11.
//  Copyright © 2016年 mac. All rights reserved.
//

import UIKit

class MainTabbar: UITabBar {
//    重写父类的init的方法
    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(plusBut)
        
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    override func  layoutSubviews() {
        super.layoutSubviews()
//        设置uitabbarbutton的位置和宽高
        let w = self.bounds.width/5
        let h = self.bounds.height
        
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        var index : CGFloat =  0
        for subView in  subviews{
     if subView.isKindOfClass(NSClassFromString("UITabBarButton")!){
        subView.frame = CGRectOffset(rect, index * w, 0)
      
        index += (index == 1 ? 2 : 1)
            }
            plusBut.frame = CGRect(x: w*2, y: 0, width: w, height: h)
        }
    }
//   懒加载button
    lazy var plusBut : UIButton = {
//    实例化一个button
        let btn = UIButton()
//        设置button的背景图片
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: .Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: .Highlighted)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: .Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState:.Highlighted)
        btn.sizeToFit()
        return btn
    
    }()
    
    
}

